M4 M5 M6 M8 Transparent Suckers With Screw PVC Plastic Sucker Pad Holder Turn Nut Glass Table Tops Storage Tool Hooks 4p-100Pcs

Product Name: PVC Suction Cup with Galvanized Iron Screw / Threaded Vacuum Sucker Pad / Screw Mount Transparent Suction Cup
Material: Clear PVC (Polyvinyl Chloride) + Galvanized Iron Screw
Thread Size (Screw): M4, M5, M6, M8 (selectable from variations)
Product Color: Transparent
Product Overview
This transparent PVC suction cup features a built-in galvanized iron screw mount, offering a simple "no drill, no glue" solution for attaching various objects to smooth surfaces such as glass doors, windows, ceramic tiles, metal panels, and windshields. The suction cup creates a vacuum seal through atmospheric pressure, providing reliable holding force without drilling holes or leaving adhesive residue. After the suction cup is firmly attached, the galvanized screw allows you to secure brackets, light fixtures, small equipment, towel racks, signs, and other lightweight items directly to the suction cup. The combination of a high-quality PVC suction pad and a corrosion-resistant galvanized screw ensures stable support for everyday household and light industrial applications.
Key Features
Clean No-Drill Installation – Zero Damage to Surface
No power tools, wall plugs, screws, or adhesives are needed. Simply press the suction cup against the target surface, squeeze out excess air, and the threaded mount is immediately ready for use. When you decide to remove or reposition the suction cup, gently lift the edge to break the vacuum seal. The surface remains undamaged, residue-free, and ready for the next installation, making this product ideal for rental properties, temporary setups, and DIY installations.
Strong and Reliable Vacuum Seal
The soft, elastic PVC material conforms tightly to smooth, non-porous surfaces, creating an airtight vacuum seal that firmly resists gravity pulling force. Test reports show that PVC suction cups of similar construction can achieve an adsorption force of approximately 1 kg per unit on clean smooth surfaces, ensuring that most daily items remain securely mounted without sudden detachment during normal service. For heavier fixtures and brackets, multiple suction cups can be used together to distribute the load across a wider area for added safety and stability.
Clear Transparent PVC – Clean Aesthetic Look
The suction cup is molded from clear PVC, which blends almost invisibly against glass, metal, and other transparent or neutral surfaces. Unlike opaque black rubber suction cups, the transparent design preserves the clean visual appearance of mounting areas, an important consideration for glass display cases, shower enclosures, and decorative applications.
Galvanized Iron Screw – Corrosion-Resistant and Durable
The integrated screw is manufactured from galvanized iron (zinc electroplated carbon steel). The zinc coating significantly improves corrosion resistance compared to untreated carbon steel. For standard indoor environments such as bathrooms, kitchens, living rooms, bedrooms, and offices, the galvanized coating provides dependable long-term performance without visible rusting. (For continuous high-humidity outdoor or marine applications, stainless steel thread options are available by custom order.)
Reusable and Environmentally Friendly
Unlike adhesives that lose effectiveness after a few uses, PVC suction cups can be attached, detached, cleaned, and reattached hundreds of times. When the vacuum seal begins to weaken over extended periods of service, simply wash the cup with mild soapy water, wipe the targeted surface clean, and reinstall. The suction cup regains its original adsorption strength, offering a sustainable, long-lasting reusable solution that minimizes adhesive waste.
Wide Operating Temperature Range
The modified PVC material maintains its elastic deformation capability across a temperature span from approximately -20°C to +80°C (minus four degrees Fahrenheit to 176 degrees Fahrenheit). This broad temperature tolerance allows the suction cup to perform reliably in cold drafts (such as near windows in winter) and hot environments (such as in front of a shower door heated by direct sunlight).
Soft Cushioning Effect – Damage-Free to Surfaces
The soft PVC material acts as a gentle cushion between the metal screw attachment and the surface. There is no risk of scratching the underlying glossy finish, making it safe for use directly on original glass, polished marble, high-gloss automotive paint, and other delicate surfaces.
Transparent Surface – Conceals Visible Fasteners
The transparent body partly obscures the metal screw thread, reducing the visual presence of the mounting hardware. This is particularly beneficial for museum-grade art displays and luxury glass shelving where conventional visible brackets would distract from the design theme.
Compatible with Standard Nuts
The exposed threaded end (M4 / M5 / M6 / M8) accepts standard metric hex nuts, wing nuts, cap nuts, or plastic knurled nuts. You may use a nut to lock the attached item in place or to create an adjustable standoff according to your installation requirements.
Self-Contained Fastening System
The combination of screw and suction cup forms a complete standalone fastener. There is no need for separate hardware or tools. This all-in-one design greatly simplifies installation for bracket and small-device mounting applications.
Application Versatility
The thread size range (M4, M5, M6, M8) covers a wide variety of attachment needs:
M4: Suitable for lightweight signs, small nameplates, miniature light fixtures, and decorative rings
M5: Ideal for medium-weight brackets, small shelves, vanity mirrors, and towel racks
M6: Recommended for heavy mounting applications, larger brackets, display shelves, and adjustable leveling feet
M8: Suitable for commercial fixtures, large signage, equipment bumpers, and heavy-duty protectors
Product Specifications
Feature Detail Suction Cup Material Clear PVC (Polyvinyl Chloride) Screw Material Galvanized Iron (Zinc Electroplated Carbon Steel) Thread Sizes Available M4, M5, M6, M8 Product Color Transparent Adsorption Force (Test Reference) Approx. 1,000 g per unit (on clean, smooth glass surface) Operating Temperature Approx. -20°C to +80°C (suitable for household use) Applications Glass doors, windows, mirrors, ceramic tiles, metal panels, windshields, etc. Installation No drilling, no tools, no adhesive residue Environmental Reusable, compliant with RoHS and REACH standards Use Limitation Smooth, non-porous surfaces only (glass, tiles, polished metal, acrylic) Not Suitable For Porous surfaces (brick, concrete, uncoated wood), rough textures, textured wallpaper, or high humidity/vibration environments
Application Scenarios
Furniture and Household
Securing glass table tops to metal or wooden frames
Adjustable feet for sofas, chairs, coffee tables, and bed frames
Attaching small shelves, towel racks, soap dishes, and toothbrush holders to bathroom tiles
Fixing cabinet door buffers and anti-collision pads
Home Decoration and Organization
Installing window curtains, blinds, and vertical blinds on glass panels
Hanging delicate wall art, photo frames, and hanging plants on tiled walls without drilling
Temporary mounting of holiday string lights, decorative wreaths, and banners
Securing pet feeding bowls to smooth floors to prevent sliding
Office and Workshop Applications
Mounting whiteboards, magnetic boards, corkboards, and small signs to metal filing cabinets
Installing small tool holders, cable clips, and accessory trays on workshop pegboards
Fixing portable work lights, magnifying lamps, and document lights to workstations
Automotive (Interior Only – Not for External High-Speed Use)
Securing dash cams, GPS units, phone holders, and small displays to the inside surface of windshields
Attaching rearview mirror accessories and sunshades
(Safety Note: Not intended for external high-speed or load-bearing vehicle components; do not attach heavy external fixtures)
Pet Accessories
Creating suction-cup hammocks for cats, dogs, and small animals on floor-to-ceiling glass windows
Securing feeding bowls, pet beds, and scratching posts to smooth flooring
Temporary Industrial and Event Setup
Mounting exhibition banners, temporary partitions, and lighting equipment on smooth panels for tradeshows
Attaching safety warning signs to clean glazed surfaces in construction zones (non-structural only)
Installation Instructions
Important Pre-Installation Checklist:
The vacuum seal strength and holding force of the suction cup depend directly on surface cleanliness, flatness, and non-porous texture. For reliable performance, please observe the following requirements:
Surface Condition: The mounting surface must be perfectly smooth, flat, non-porous, and free of dust, grease, soap residue, wax, and any other contaminants (glass, polished ceramic tiles, glossy metal, Formica, and acrylic are all suitable)
Surface Cleanliness: Clean the intended attachment area with a mild soap solution or glass cleaner, then dry thoroughly with a lint-free cloth prior to installation
Ambient Temperature: For best results, the surface temperature should remain between +10°C and +40°C (fifty degrees Fahrenheit and one hundred four degrees Fahrenheit) during initial application
Limitations: Avoid use on textured surfaces (brick, rough concrete, uncoated wood), damp surfaces, surfaces with pronounced curvature (shower stall cylinders with high curvature), or surfaces previously treated with non-stick coatings, sealants, and waxes

Installation Steps:
Surface Preparation – Wash and Dry Target Area: Use a clean wet cloth to lightly dampen the mounting position with lukewarm soapy water; wipe away any leftover film, residue, and partially dried soap; then dry the surface carefully with a fresh lint-free cloth; allow the entire surface to reach a bone-dry state (no visible wet spots) before proceeding
Suction Cup Initial Fitting – Center Placement: Position the suction cup on the intended spot, ensuring the entire rim comes in direct contact with the surface without any noticeable gap or corner that is not in contact
Apply Strong, Balanced Hand Force: Press the cup firmly and uniformly downward using your palm, forcing trapped air outward from the center until all air bubbles are eliminated; continue to apply steady inward pressure until the full area adheres smoothly to the substrate. For very large-diameter cups, you may hear a soft clicking sound as the vacuum forms or notice the center of the cup pulling itself tighter into the glass; this confirms a successful seal
Verify Tight Seal (Vacuum Confirmation): Visually inspect the contact zone; the suction cup should appear fully flattened against the surface without any raised edges or trapped bubbles; test the initial grip before attaching your final load
Attach Your Bracket, Fixture, or Light Equipment to the Screw: Slide the bracket (mounting hole) over the threaded stem or screw the attached object onto the thread; for better torque transmission, you may add a lock nut (not included unless ordered separately) to sandwich the bracket between the suction cup face and the nut
Tighten the Nut (Optional Anti-Loosening Measure): For installations subjected to moderate vibration (e.g., automotive interior accessories, appliances with motor startup vibration), we recommend using a compatible nut to lock the bracket firmly; this prevents the attached item from unscrewing during operation and loosening with prolonged movement cycles
Maintenance and Re-Tensioning
Routine cleaning: For weekly bathroom use, rinse the suction cup with tap water each time you clean the bathroom. Allow both the suction cup and the ceramic tile surface to dry completely before reaffixing for the strongest seal. For kitchen and automotive applications, avoid exposure to silicone-based furniture polish (spray type), greasy residues, and food oil splatter—these slippery films drastically reduce holding vacuum force.
Reactivation after loss of suction: Over time, PVC may lose surface pliability and dust accumulation may prevent a perfect seal. To fully restore performance, wash the suction cup with warm water and a tiny amount of mild dish detergent (no degreasers, no citrus solvents) using a soft bristle toothbrush (gentle scrubbing to clean the inner recess). Rinse thoroughly, dry with a fresh lint-free towel, and scrub the surface area of the tile/window again. Re-press the suction cup firmly—the suction force should return to near the original level.
Important Notes – Please Read Before Ordering
Surface Compatibility – Critical for Performance: The suction cup requires a perfectly smooth, clean, non-porous surface to establish a lasting vacuum seal. Vinyl wallpaper, rough tile with visible texture, brushed concrete, unfinished wood, ABS plastic surfaces (the raw material form, not the surface of a finished appliance), etc., are NOT suitable for reliable attachment. Attaching to any such surface will result in immediate or rapid air infiltration, and the suction cup will not hold.
Load Limit and Testing: The approximate suction force (approx. 1 kg of static vertical pull) is a reference value measured in ideal test conditions (absolutely flat, degreased glass surface at moderate temperature). Real-world adhesion is affected by many variables: surface curvature, roughness, chemical film, ambient humidity, and the duration of load application. Always test the seal by applying a light manual pull or using a less valuable item during initial installation. For safety-critical or high-value objects (large televisions, heavy shelves, vases, containers with temperature-sensitive biological cultures, etc.), do not rely on a single suction cup; use multiple cups in a distributed pattern with secondary backup mechanical fastening.
Dust, Scratches, and PVC Aging: Dust particles trapped on the rim act as micro-leak paths—the suction will fail slowly over hours. Inspect the sealing lip and wipe off any visible particles before pressing the cup into place. The PVC material may develop microcracks and lose flexibility over many years of service, especially under intense direct UV sunlight exposure or extended severe heat beyond 85°C. Replace the cup if you see visible hardening or cracks.
Screw Corrosion Margin – Indoor Use Only: The screw is manufactured from galvanized iron. The zinc coating provides adequate performance for interior household environments (bathrooms, kitchens, bedrooms, offices). In aggressive corrosive settings (salt spray, chlorinated swimming pool water splashing, constant submersion, high-ozone industrial zones), the plating will eventually degrade. Upgrade to stainless steel threads (custom order with additional MOQ requirement) if corrosion protection is critical.
Color and Surface Realism in On-Screen Photos: Product photos are captured under different studio lighting conditions and displayed across a range of monitor panels. The transparent PVC material may appear practically glass-clear or show a slight whiteness depending on how the light refracts around the screen. This is not a defect of the material or indication of yellowing; the actual delivered physical product is uniformly clear and free from color cast.
Dimensional Tolerance for Manufactured Cups: Suction cups are molded in silicone, rubber, PVC, or TPE tooling cavities. Small variations in the molded outer diameter (±0.5 mm to ±1.0 mm) are within standard mass production allowances. For precision bulk applications requiring a guaranteed exact construction dimension for jig assembly, contact our sales engineers before placing the purchase order.
Replacing Old Suction Cups: If you are replacing worn suction cups from an existing ready-made assembly (e.g., one part of a broken shower shelf or a vehicle phone holder), ensure you match either the overall cup diameter or thread size (M4, M5, M6, M8) to the existing bracket holes before ordering. For assistance regarding your particular product replacement, please send a photo of the original suction cup and the threaded fitting you intend to reuse.
Package Contents
X piece(s) of Clear PVC Suction Cup with Galvanized Iron Screw (quantity and thread size as selected from the variation options)
Brackets, nuts, and mounting hardware are sold separately unless accompanied by a specific variation note